基于CFD的排水型三体无人艇阻力优化研究

Research on optimization of displacement trimaran USV resistance based on CFD

为预报某三体无人艇的静水航行阻力,利用STAR-CCM+软件对船体进行计算流体动力学仿真。基于船体的航速和排水量等设计参数,考虑侧体纵向位置和侧体船型2种因素,选取不同设计方案进行计算。结合后处理得到的流场特征对仿真结果进行分析,总结阻力变化规律,探讨船体水动力性能的变化机理。结果表明:侧体纵向位置后移可减小片体间兴波扰动,减阻率最大约6.7%;改变侧体型宽会小幅度降低船体压阻,其最大减阻率约4.5%。汇总多种船型方案的计算结果,为三体无人艇的后续研究提供参考。

To predict the hydrostatic resistance of a trimaran USV,computational fluid dynamics simulation of the hull is performed using STAR-CCM+.Based on the design parameters such as the speed and displacement of the hull,different design solutions are selected for the computation considering two factors:side hull longitudinal position and side hull form.The simulation results are analyzed combining the flow field characteristics obtained from post-processing,the resistance change laws are summarized and the change mechanism of the hull hydrodynamic performance are recognized.The results show that shifting the longitudinal position of the side hull can reduce the wave disturbance between the hulls,and the maximum drag reduction rate is about 6.7%.The computation results of various hulls are also summarized to provide a reference for the subsequent research of this trimaran USV.